Repeatedly extract a line between two delimiters in a text file, Python

Question

I have a text file in the following format:

DELIMITER1
extract me
extract me
extract me
DELIMITER2

I\'d like to extract every block of

Answer 1

You can simplify this to one regular expression using re.S, the DOTALL flag.

import re
def GetTheSentences(infile):
     with open(infile) as fp:
         for result in re.findall('DELIMITER1(.*?)DELIMITER2', fp.read(), re.S):
             print result
# extract me
# extract me
# extract me

This also makes use of the non-greedy operator .*?, so multiple non-overlapping blocks of DELIMITER1-DELIMITER2 pairs will all be found.